On-line detection device and detection method for roll mark defects on surface of strip steel

Abstract

The invention relates to an online detection device for strip steel surface roller mark defects. The online detection device comprises a safety fence and a detection mechanism, the strip steel can penetrate through the middle of the safety fence from top to bottom or from bottom to top; the detection mechanism comprises a stand column, a longitudinal sliding table, a transverse sliding rod and an adjusting assembly. The stand columns are located on the two sides of the safety fence and connected with the safety fence. The longitudinal sliding table is supported by the stand column and can slide up and down along the stand column. The transverse sliding rod is supported by the longitudinal sliding table and can slide along the longitudinal sliding table. According to the strip steel surface roller mark defect online detection device provided by the invention, an operator can completely find and detect the strip steel surface roller mark defect online by virtue of manual naked eyes through the movement of the adjusting assembly, and the detection device has the characteristics of easiness in manufacturing, low cost, convenience in installation and high applicability; and high cost investment of surface defect detection equipment based on an industrial visual system and complex algorithm development aiming at different defect forms are avoided.

Description

Technical Field

[0001] The invention relates to an online detection device and a detection method for roller mark defects on a strip steel surface, belonging to the technical field of metal smelting. Background Art

[0002] Modern cold rolling production lines mainly include pickling, continuous annealing, electro-tinning, hot-dip galvanizing, hot-dip galvanizing and other units. Although the specific production processes of these units are different, they all pass through a large number of rollers with different diameters and surface morphologies between the unwinder and the coiler, and then enter different process equipment to complete various process treatments. Fig. 9 As shown, taking the cold rolling hot-dip aluminum-zinc unit as an example, the strip 1 passes through the uncoiler and then passes through the cleaning section for surface cleaning, and then passes through the zinc pot sinking roller 2 to enter the zinc pot 3 for hot-dip after being heated in the annealing furnace. After coming out of the zinc pot 3, the strip 1 passes through the top roller 4 above the zinc pot and the bottom roller 5 of the quenching tank to enter the quenching tank 6 for cooling treatment, and then passes through the quenching tank turning roller 7 to enter the leveling machine 9, and then passes through the leveling machine working roller 8 and tensioning roller 10 to enter the looper 12, and then passes through the looper roller 11 and enters the coiler 14 through the quality inspection room 13. In the entire hot-dip aluminum-zinc production process, the surface of the strip 1 needs to contact with the surfaces of hundreds of various rollers. When foreign matter adheres to the roller surface or the material of the roller surface peels off, roller mark defects will be generated on the surface of the strip during the contact between the strip and the roller surface. The roller mark defects on the strip surface are mostly in the form of dots, flakes, and stripes. The probability of them being caused by rollers with steel surfaces is much greater than that caused by rollers with rubber surfaces. At the same time, the roller mark defects on the strip surface also have an obvious periodic pattern in the length direction of the strip.

[0003] At present, in the production process of each unit of the cold rolling production line, there are two urgent problems to be solved for the frequent roller mark defects on the surface of the strip: 1) It is difficult to quickly detect the roller mark defects on the surface of the strip online and the cost is high. Because the cold rolling production line has a high running speed and the roller mark defect morphology is relatively complex, the investment cost and missed detection rate of the development of a high-speed visual inspection system are high, and it has not been applied on a large scale in the cold rolling production line. The existing cold rolling production line roller mark defect detection mainly relies on manual random selection of strip steel at the quality inspection table to suspend the operation, and visually search and detect when the strip steel is stationary. The detection rate is low and it also affects the production line capacity improvement. 2) It is difficult to accurately locate the roller mark defects on the surface of the strip steel and the processing efficiency is low. It is mainly reflected in the fact that after the roller mark is found by the naked eye, it is necessary to manually use measuring tools such as tape measures to measure the roller mark position on the static strip surface, and then arrange several people to go to the site according to the location of the roller mark on the strip surface to check the surface state of the rollers in contact with the strip surface on the production line one by one, and deal with the foreign matter found on the roller surface. This processing process is time-consuming and labor-intensive, and often causes batch quality accidents on the production line. Summary of the invention

[0004] The technical problem to be solved by the present invention is: to overcome the disadvantages of the above-mentioned technology and to provide a device which can assist in the detection of roller mark defects on the surface of artificial steel strip.

[0005] In order to solve the above technical problems, the first technical solution proposed by the present invention is: an online detection device for roller mark defects on the surface of strip steel, comprising: a safety fence and a detection mechanism; the strip steel can pass through the middle of the safety fence from top to bottom or from bottom to top; the detection mechanism comprises a column, a longitudinal slide, a transverse slide and an adjustment component; the columns are located on both sides of the safety fence and are connected to the safety fence; the longitudinal slide is perpendicular to the plane of the strip steel passing through the safety fence; the longitudinal slide is supported by the columns and can slide up and down along the columns; the transverse slide is arranged along the width direction of the strip steel passing through the safety fence, and the transverse slide is supported by the longitudinal slide and can slide along the longitudinal slide; The adjustment assembly includes: a rotating drum, a lamp and a handle; the rotating drum is sleeved on the transverse slide bar and can slide along the transverse slide bar, and the rotating drum can also rotate relative to the transverse slide bar; the lamp and the handle are both installed on the rotating drum; the handle has a plurality of buttons; One end of the transverse sliding bar is provided with a distance meter, which can measure the distance between the adjustment component and the distance meter.

[0006] A further improvement of the above scheme is that: a guide groove capable of limiting the rotation range of the rotating drum is provided in the rotating drum.

[0007] A further improvement of the above solution is that both the button and the rangefinder are connected to the controller.

[0008] A further improvement of the above scheme is that the safety fence is a cage-shaped safety protection mechanism with a rectangular cross-section, welded from carbon steel pipes, and its upper and lower ends are respectively welded to the roof and ground steel structure of the quality inspection room; the minimum distance between the safety fence and the edge of the strip passing through the safety fence is 100mm, and the minimum distance from the surface is 300mm.

[0009] In order to solve the above technical problems, the second technical solution proposed by the present invention is: an online detection method for roller mark defects on the surface of a strip steel, comprising the following steps: (1) Quality inspection begins; the operator adjusts the strip running speed of the safety fence, turns on the lamp, drives the adjustment component by the handle, adjusts the lamp to illuminate the surface of the strip, and then moves the adjustment component back and forth along the transverse slide bar to search for roller mark defects on the strip surface by naked eyes; (2) Roller mark detection: When the operator finds a roller mark defect on the strip surface, he / she immediately presses any button and stops moving back and forth. When the roller mark is found again at the same position on the strip surface in the width direction, he / she immediately presses the same button again. (3) Roller positioning: When the same button is pressed twice, and the difference between the distance meter values ​​at the time of the two button pressing is less than 5 mm, the strip coiling length L corresponding to the time of the two button pressing is calculated. N and L N+1 And calculate the difference D=|L N -L N+1 |, then check the circumference data of the rollers in contact with the strip surface on the on-site production line, find out the roller whose circumference is closest to D; and notify the processing personnel to conduct on-site confirmation and roller surface processing.

[0010] A further improvement of the above scheme is that in step (1), the operator controls the running speed of the strip steel to 30-50 m / min.

[0011] A further improvement of the above scheme is that in the step (2), when the roller mark is found at the same position in the width direction of the strip surface, it is necessary to effectively track it 10 times, that is, the same button is pressed and sampled 10 times.

[0012] The present invention provides an online detection device and method for roller mark defects on the strip surface. An operator can completely rely on the naked eye to discover and detect roller mark defects on the strip surface online by adjusting the movement of components. The detection device has the characteristics of easy manufacture, low cost, convenient installation and strong applicability, avoiding the high cost investment of surface defect detection equipment based on industrial vision systems and the development of complex algorithms for different defect forms. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic structural diagram of a preferred embodiment of the present invention.

[0014] Figure 2 for Figure 1 Schematic diagram of the detection mechanism structure.

[0015] Figure 3 for Figure 2 Schematic diagram of part of the explosion structure.

[0016] Figure 4 for Figure 3 Schematic diagram of the exploded structure of the adjustment component part.

[0017] Figure 5 for Figure 3 Schematic diagram of the exploded structure of the adjustment component part.

[0018] Figure 6 for Figure 3 Schematic diagram of the adjustment component and horizontal slide bar structure.

[0019] Figure 7 The figure is a schematic diagram of control relationship of a preferred embodiment of the present invention.

[0020] Figure 8 The present invention is a schematic diagram of an application state of a preferred embodiment.

[0021] Fig. 9 This is a schematic diagram of the process of hot-dip galvanizing of strip steel. Implementation

[0022] The on-line detection device for roller mark defects on the surface of the strip steel of this embodiment is as follows: Figure 1 As shown, it includes: a safety fence 20 and a detection mechanism 30; wherein the detection mechanism 30 is connected to a controller 40, and the controller 40 is connected to a server 50.

[0023] like Figure 2 and Figure 3 As shown, the detection mechanism 30 includes a column 30-1, a longitudinal slide 30-3, a transverse slide bar 30-4 and an adjustment component 30-6.

[0024] In this embodiment, there are four columns 30-1 in total, two on each side of the safety fence 20. The columns 30-1 are installed on the safety fence 20 through U-shaped buckles 30-1-2; and the columns 30-1 are provided with dovetail grooves 30-1-1.

[0025] The longitudinal slide 30-3 is installed on the column 30-1 through the cross beam 30-2. The cross beam 30-2 is a carbon steel structure with an L-shaped cross section. The side of the cross beam 30-2 facing the column 30-1 has a wedge block 30-2-1. The wedge block 30-2-1 slides in cooperation with the dovetail groove 30-1-1. The wedge block 30-2-1 also has a threaded hole, so that the column and the cross beam 30-2 are fixed by the bolt 30-2-2 passing through the column 30-1. The longitudinal slide 30-3 is installed on the cross beam 30-2. The longitudinal slide 30-3 can slide up and down along the column 30-1 to achieve height adjustment. After the adjustment is completed, it is fixed by the bolt 30-2-2.

[0026] There are two transverse slide bars 30-4, one on each of the front and rear sides of the safety fence 20. The transverse slide bars 30-4 are supported by the longitudinal slide table 30-3 and can slide along the longitudinal slide table 30-3.

[0027] like Figure 4 , Figure 5 and Figure 6 As shown, the adjustment assembly 30-6 includes: a rotating drum 30-6-1, a lamp 30-6-6 and a handle 30-6-4.

[0028] The rotating drum 30-6-1 is sleeved on the transverse slide bar 30-4 and can slide along the transverse slide bar 30-4. The rotating drum 30-6-1 can also rotate relative to the transverse slide bar 30-4. A positioning strip 30-4-1 with a width of 3mm and a thickness of 3mm is welded on the surface of the transverse slide bar 30-4 in the axial direction. The inner diameter of the rotating drum 30-6-1 is 0.5mm larger than the outer diameter of the transverse slide bar 30-4. A guide groove with a range of 30° and a depth of 4mm is axially arranged inside the rotating drum 30-6-1. In this way, through the cooperation of the positioning strip 30-4-1 and the guide groove, the rotation range of the rotating drum 30-6-1 relative to the transverse slide bar 30-4 can be limited to 30°.

[0029] Three lamps 30-6-6 are used and fixed on the drum 30-6-1 through a tube clamp 30-6-2. The lamps 30-6-6 are preferably spotlights, and the brightness can be adjusted steplessly within a certain range. At the same time, each lamp 30-6-6 can be switched on and off independently.

[0030] The handle 30-6-4 is installed in the middle of the rotating cylinder 30-6-1 through a thread; a grip 30-6-5 is installed at the end of the handle 30-6-4, and the grip 30-6-5 can be held and has 5 buttons corresponding to 5 fingers respectively.

[0031] One end of the transverse slide bar 30-4 has a rangefinder 30-5, and one end of the adjustment assembly 30-6 facing the rangefinder 30-5 is welded with a retaining ring 30-6-3. The inner diameter of the retaining ring 30-6-3 is 5mm larger than the minimum inner diameter of the drum 30-6-1, and the outer diameter of the retaining ring 30-6-3 is twice the outer diameter of the drum 30-6-1. The retaining ring 30-6-3 is used to reflect the signal of the rangefinder 30-5, so that the rangefinder 30-5 can measure the distance between the adjustment assembly 30-6 and the rangefinder 30-5.

[0032] like Figure 7 As shown, the key is transmitted to the controller 40 via a cable. The rangefinder 30-5 can accurately detect the position information of the adjustment component 30-6 on the horizontal slide bar 30-4 and transmit it to the controller 40 via a cable. The controller 40 is connected to the server 50 to collect and process the data.

[0033] like Figure 8 As shown, when this embodiment is in use, the strip steel passes through the middle of the safety fence 20 from top to bottom. The safety fence 20 provides safety protection for the operator. Its cross section is rectangular and the whole is cage-shaped. It is welded from carbon steel pipes. Its upper and lower ends are respectively welded to the roof and ground steel structure of the quality inspection room; the minimum distance between the edge of the strip steel passing through the safety fence 20 is 100mm, and the minimum distance from the surface is 300mm. The total length of the beam 30-2 meets the requirement that the front and rear ends extend 100mm outside the safety fence during installation.

[0034] Since both the upper and lower surfaces of the strip need to be inspected, the longitudinal slide 30-3 is arranged perpendicular to the strip surface, and the middle position is isolated, forming inspection stations on both the upper and lower surfaces of the strip. The transverse slide bar 30-4 extends along the width direction of the strip.

[0035] The method for detecting the strip surface roller mark defect using the online detection device of the present embodiment comprises the following steps: (1) Quality inspection begins; the operator slows down the running speed of the steel strip in the quality inspection room of the production line to 30 m / min, turns on the lamp 30-6-6, and pushes the adjustment assembly 30-6 by holding the handle 30-6-5 to move forward and backward along the longitudinal slide 30-3, so that the lamp 30-6-6 is at a suitable distance from the surface of the inspected steel strip. The operator then moves the handle 30-6-5 up and down to adjust the illumination angle of the lamp 30-6-6 to the best defect observation angle, and at the same time moves the lamp 30-6-6 back and forth along the transverse slide 30-4 to scan and observe, and searches for roller mark defects on the surface of the steel strip with the naked eye.

[0036] (2) Roller mark detection: When the operator finds a roller mark defect on the strip surface under the illumination of the lamp 30-6-6, he immediately presses any button 30-6-7 on the handle 30-6-5 and stops the left and right movement scanning. When the roller mark is found again at the same position on the strip surface in the width direction, the same button is immediately pressed again, and the tracking is continued for 10 times. The signal of each press of the button 30-6-7 will be transmitted to the controller 40. The controller 40 combines the current unit strip width specification, the detection value of the corresponding rangefinder 30-5 when the button 30-6-7 is pressed each time, the current online strip coiling length, and the fixed strip length data from the quality inspection station to the coiler, and can record the specific position data of the roller mark defect detected each time on the strip surface. For example, in this embodiment, the strip roller mark defect is detected to appear on the upper surface of the current coil of strip at a length of 800 meters, 20 mm away from the right side edge of the strip in the forward direction.

[0037] (3) Roller printing positioning; the controller 40 collects and identifies the key signal. When the same key is pressed twice, the corresponding detection value X of the rangefinder 30-5 each time is N , where |X N -X N+1 |≤ 5mm, it is considered that the same roller mark defect occurs periodically. At this time, the controller 40 records the corresponding strip coiling length L for the two times the same key is pressed. N and L N+1 And calculate the absolute value of the difference D 1...N =|L N -L N+1|, and then automatically compare the circumference data of the rollers in contact with the strip surface on the on-site production line in the server 40 database to find out the rollers that are in contact with the strip surface. 1...N The closest roller information is given to the roller printing processing personnel for on-site confirmation and roller surface processing. For example, in this embodiment, the controller 40 detects the time when the same key is pressed twice before and after, and records the corresponding strip coiling length and calculates the absolute value of the difference D 1...N =|L N -L N+1 |=|800-801.56|=1.56 meters, while the circumference data of the working roller of the unit's leveling machine in the server 50 database is 1.57 meters. Therefore, after comparison, the controller 40 prompts that the roller mark defect of the current strip is caused by the working roller of the leveling machine. Based on this judgment, the production operator can go to the site to confirm and take the next step to deal with the roller that causes the roller mark defect and the foreign matter on the roller surface.

[0038] The present invention is not limited to the above embodiments. Any technical solution formed by equivalent replacement falls within the protection scope required by the present invention.

Claims

1. An online detection device for roller mark defects on the surface of a strip steel, characterized in that: include: Safety fence and detection mechanism; the strip steel can pass through the middle of the safety fence from top to bottom or from bottom to top; the detection mechanism includes a column, a longitudinal slide, a transverse slide and an adjustment component; the columns are located on both sides of the safety fence and are connected to the safety fence; the longitudinal slide is perpendicular to the plane of the strip steel passing through the safety fence; the longitudinal slide is supported by the columns and can slide up and down along the columns; the transverse slide is arranged along the width direction of the strip steel passing through the safety fence, and the transverse slide is supported by the longitudinal slide and can slide along the longitudinal slide; The adjustment assembly includes: a rotating drum, a lamp and a handle; The rotating drum is sleeved on the transverse sliding rod and can slide along the transverse sliding rod. The rotating drum can also rotate relative to the transverse sliding rod. The lamp and the handle are both installed on the rotating drum. The handle has a plurality of buttons. One end of the transverse sliding bar is provided with a distance meter, which can measure the distance between the adjustment component and the distance meter.

2. The on-line detection device for roller mark defects on the surface of steel strip according to claim 1 is characterized in that: The rotating drum has a guide groove therein which can limit the rotation range of the rotating drum.

3. The on-line detection device for roller mark defects on the surface of steel strip according to claim 1 is characterized in that: The button and the distance meter are both connected to the controller.

4. The on-line detection device for roller mark defects on the surface of steel strip according to claim 1 is characterized in that: The safety fence is a cage-shaped safety protection mechanism with a rectangular cross-section, welded from carbon steel pipes, and its upper and lower ends are respectively welded to the roof and ground steel structure of the quality inspection room; the minimum distance between the safety fence and the edge of the strip passing through the safety fence is 100mm, and the minimum distance from the surface is 300mm.

5. A detection method using the on-line detection device for roller mark defects on the surface of a steel strip as claimed in claim 1, characterized in that: The steps include: (1) Quality inspection begins; the operator adjusts the strip running speed of the safety fence, turns on the lamp, drives the adjustment component by the handle, adjusts the lamp to illuminate the surface of the strip, and then moves the adjustment component back and forth along the transverse slide bar to search for roller mark defects on the strip surface by naked eyes; (2) Roller mark detection: When the operator finds a roller mark defect on the strip surface, he / she immediately presses any button and stops moving back and forth. When the roller mark is found again at the same position on the strip surface in the width direction, he / she immediately presses the same button again. (3) Roller positioning: When the same button is pressed twice, and the difference between the distance meter values ​​at the time of the two button pressing is less than 5 mm, the strip coiling length L corresponding to the time of the two button pressing is calculated. N and L N+1 And calculate the difference D=|L N -L N+1 |, then check the circumference data of the rollers in contact with the strip surface on the on-site production line, and find the roller whose circumference is closest to D; And notify the processing personnel to conduct on-site confirmation and roller surface processing.

6. The detection method according to claim 5, characterized in that: In the step (1), the operator controls the running speed of the strip steel to be 30-50 m / min.

7. The detection method according to claim 5, characterized in that: In the step (2), when the roller mark is found at the same position in the width direction of the strip surface, effective tracking is required 10 times, that is, the same button is pressed and sampled 10 times.

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